then - university of british columbia
TRANSCRIPT
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Wood Products Taxonomy
Engineered Wood
Products
I-Beams
Roof trusses
WOOD
Composites Solid Wood
Panels
Engineered Lumber
Composites (ELC)
Wood/ Non-wood
Wood Based
Wood/ Cement Particleboard
MDF
Plywood
OSB
LVL
OSL
Softwood Lumber
Glued
Treated
Hardwood
Lumber
Boards
Dimension
Timber
MSR
Finger joined
Edge glued
Glulam
CCA treated
Fire retardant
Hardwood
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1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
CCA-treated Lumber
Light Frame Trusses Lumber
Panels
Plywood Particleboard Waferboard
Medium Density Fiberboard
Oriented Strand Board
MSR Lumber
Wood I-Beam
Laminated Veneer Lumber
Glue Laminated Lumber
Parallel Strand Lumber
Laminated Strand Lumber
Commercial introduction for major wood products
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Solid Wood - Boards
Boards
Dimension Lumber
Timber
Machine Stress Rated
Softwood Lumber
1” thick material finished, non-structural markets are: export, industrial, home center N.A. production likely to increase
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Solid Wood - Dimension Lumber
2x4, 2x6, 2x8 construction lumber majority of lumber produced in North America N.A. production has grown 1.4% p.a. over last 20 years bulk commodity product with little specialization
Boards
Dimension Lumber
Timber
Machine Stress Rated
Softwood Lumber
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Solid Wood - Timber
minimum dimensions 5.5” mainly for export market production is decreasing high-end product
Boards
Dimension Lumber
Timber
Machine Stress Rated
Softwood Lumber
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Solid Wood - Machine Stress Rated
mechanically graded lumber structural end-uses value-added lumber product use is increasing in traditional and new markets
1950f - 1.7E
Boards
Dimension Lumber
Timber
Machine Stress Rated
Softwood Lumber
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Solid Wood - Finger joined
Finger joined
Edge-glued
Glulam
Glued
longer lengths produced from shorter stock allow defects to be reduced structural or non-structural utilized in lumber, glulam, I-beams markets are increasing
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Solid Wood - Edge-glued panels
Finger joined
Edge-glued
Glulam
Glued
edge-lamination of wood wider widths from narrow material stable-panel produced industrial and finished retail products
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Solid Wood - Glulam
Finger joined
Edge-glued
Glulam
Glued
“glue-laminated” lumber uses high quality, stress-rated “lamstock” used as beams and columns structural, architectural uses
Individuallaminations
Finger joint
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Solid Wood - Hardwood Lumber
Hardwood
HardwoodLumber
used for architectural rather than structural products main NA supply from eastern NA
grading system based on cutting high quality boards from rough lumber used for flooring, trim & molding, joinery, cabinets
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Particleboard
non-structural panel product uses waste particles from other processes surface is smooth but edges are not used mostly for industrial purposes
Particleboard
MDF
Plywood
OSB
Wood-based
Panels
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Medium Density Fiberboard
non-structural panel product uses mechanically produced wood fibres superior machinability to particleboard markets are growing rapidly
Particleboard
MDF
Plywood
OSB
Wood-based
Panels
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Plywood
structural panel product uses high quality softwood veneers manufactured in 4x8ft sheets market is steady or declining
FaceCore
Crossband
Grain direction
Particleboard
MDF
Plywood
OSB
Wood-based
Panels
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Oriented Strandboard
uses flakes or strands (approx. 20x100x1mm) aspen, poplar, pine, mixed hardwoods used produced as large panels (up to 12x24ft) structural panel as replacement for softwood plywood market is growing rapidly
Particleboard
MDF
Plywood
OSB
Wood-based
Panels
Variation in wood products
frequency
strength
Solid wood lower 5th percentile
mean
÷ safety factors
allowable design stress
Variation in wood products
frequency
strength
Solid wood lower 5th percentile
mean
÷ safety factors
allowable design stress
allowable design stress
lower 5th percentile
÷ safety factors
Wood composite A
mean
Variation in wood products
frequency
strength
Solid wood
lower 5th percentile
mean
÷ safety factors
allowable design stress
allowable design stress
lower 5th percentile
÷ safety factors
mean
Wood composite B
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Laminated Veneer Lumber (LVL)
Laminated VeneerLumber (LVL)
Oriented StrandLumber (OSL)
EngineeredLumber Composites
veneers glued with grain running parallel to each other veneers graded prior to assembly used on flat or on edge used as I-beam flanges, beams and joists
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Oriented Strand Lumber (OSL)
uses long strands of wood wide variety of dimensions possible Parallam, 2.3mx1cm veneers, high-end structural uses TimberStrand, 30cmx2cm flakes, window frames, door stock, wall studs
Laminated VeneerLumber (LVL)
Oriented StrandLumber (OSL)
EngineeredLumber Composites
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I-Beams
I-Beams
Roof trusses
EngineeredWood Products
flanges - lumber, MSR lumber, LVL, OSL webs - plywood, OSB replace wide, solid pieces of wood used as floor joists, roof rafters
flange
web
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Roof Trusses
small dimension, short lengths of wood combined to produce large-sized, long length support members held together with truss plates often custom-designed using MSR lumber pitch-chord or parallel-chord
Top chord Web
Truss plateBottom chord
I-Beams
Roof trusses
EngineeredWood Products